solr4.7.2开发实践 ——拼写检查spellcheck【需要修改为自己配置的】

文章来源：http://my.oschina.net/MrMichael/blog/261242

①拼写检查不同于其他域，它在建立索引时需要分词，但是检索时不需要分词，所以要建立一个特殊的域，以供拼写检查：

在schema.xml文件里设置所需的拼写检查域都有哪些字段：

 < field  name = "spell"  type = "text_spell"  indexed = "true"  stored = "false"  multiValued = "true"  />

< copyField  source = "name"  dest = "spell" />
 < copyField  source = "content"  dest = "spell" />

< fieldType  name = "text_spell"  class = "solr.TextField"  positionIncrementGap = "100" >
     < analyzer  type = "index" >
     < tokenizer  class = "org.wltea.analyzer.lucene.IKTokenizerFactory"  useSmart = "false"  conf = "ik.conf" />
     < filter  class = "solr.StopFilterFactory"  ignoreCase = "true"  words = "stopwords.txt"  enablePositionIncrements = "true"  />
     </ analyzer >
     < analyzer  type = "query" >
       < tokenizer  class = "solr.WhitespaceTokenizerFactory" />
     </ analyzer >
  </ fieldType >

②在solrconfig.xml文件里设置：

 < searchComponent  name = "spellerror"  class = "solr.SpellCheckComponent" >
    < str  name = "queryAnalyzerFieldType" >text_spell</ str >
    <!-- a spellchecker built from a field of the main index   -->
    < lst  name = "spellchecker" >
      < str  name = "name" >default</ str >
      < str  name = "field" >spell</ str >
      < str  name = "classname" >solr.DirectSolrSpellChecker</ str >
      < str  name = "distanceMeasure" >internal</ str >
      < float  name = "accuracy" >0.5</ float >
      < int  name = "maxEdits" >2</ int >
      < int  name = "minPrefix" >1</ int >
      < int  name = "maxInspections" >5</ int >
      < int  name = "minQueryLength" >2</ int >
      < float  name = "maxQueryFrequency" >0.01</ float >
    </ lst >
 < lst  name = "spellchecker" >
   < str  name = "classname" >solr.FileBasedSpellChecker</ str >
   < str  name = "name" >file</ str >
   < str  name = "sourceLocation" >spellings.txt</ str >
   < str  name = "characterEncoding" >UTF-8</ str >
   < str  name = "spellcheckIndexDir" >spellcheckerFile</ str >
    </ lst >
  </ searchComponent >
  < requestHandler  name = "/spell"  class = "solr.SearchHandler"  startup = "lazy" >
    < lst  name = "defaults" >
      < str  name = "df" >spell</ str >
      < str  name = "spellcheck.dictionary" >default</ str >
      < str  name = "spellcheck" >on</ str >
      <!-- <str name="spellcheck.extendedResults">true</str>
      <str name="spellcheck.count">10</str>
      <str name="spellcheck.alternativeTermCount">5</str>
      <str name="spellcheck.maxResultsForSuggest">5</str> -->
      < str  name = "spellcheck.collate" >true</ str >
      < str  name = "spellcheck.collateExtendedResults" >true</ str >
      <!-- <str name="spellcheck.maxCollationTries">10</str>
      <str name="spellcheck.maxCollations">5</str> -->
    </ lst >
    < arr  name = "last-components" >
      < str >spellerror</ str >
    </ arr >
  </ requestHandler >

③solrj里的代码

/**
    * @method: testSpellCheck
    * @Description: 拼写检查
    *
    * @author: ChenYW
    * @date 2014-4-15 下午06:14:56
    */
    public  String spellCheck(String word){
        SolrQuery query =  new  SolrQuery();
        query.set( "defType" , "edismax" ); //加权
        query.set( "qf" , "name^20.0" );

        query.set( "spellcheck" ,  "true" );
        query.set( "spellcheck.q" , word);
        query.set( "qt" ,  "/spell" );
        query.set( "spellcheck.build" ,  "true" ); //遇到新的检查词，会自动添加到索引里面
        query.set( "spellcheck.count" ,  5 );

        try  {
         QueryResponse rsp = server.query(query);
         SpellCheckResponse re=rsp.getSpellCheckResponse();
         if  (re !=  null ) {
          if (!re.isCorrectlySpelled()){
              String t = re.getFirstSuggestion(word); //获取第一个推荐词
     System.out.println( "推荐词："  + t);
     return  t;
          }
         }
        }  catch  (SolrServerException e) {
            e.printStackTrace();
        }
        return  null ;
    }